Attachment for dumb-waiter shafts.



L. WIEBKE & A. W. BULL.

ATTACHMENT FOR DUMB WAITER SHAFTS.

APPLICATION FILE'D NOV. 7, 1914.

Patented June 29, 1915.

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@Thtd ATENT FFTQEQ LOUIS WIEBKE AND ALBERT W. BULL, OF NEW YORK, N. Y.; SAID BULL ASSIGNOR TO SAID WIEBKE.

ATTACHMENT FOR DUMB-VJAITER SHAFTS.

Application filed November 7, 1914.

To all whom it may concern:

Be it known that we, LOUIS VVmBKn and ALBERT W. BULL, citizens of the United States, residing at New York, in the county of New York and State of New York, have invented new and useful Improvements in Attachments for Dumb-Waiter Shafts, of which the following is a specification.

The general object of this invention is to facilitate the operation of dumb-waiters and the like by reducing to a minimum the friction generated by the operating rope contacting with the edges of the shaftopenings and thereby prevent the chafing of the rope in addition to prolonging the life of the same. And to these ends the invention consists of a yokeshaped bracket having a rotatable sheave and adapted to be mounted on the upper end of a shaft opening so that the operating rope may be trained over the sheave during the operation of the dumb-waiter.

Other objects will appear and be better understood from that embodiment of our invention of which the following is a specification, reference being had to the accompanying drawing forming part hereof, 1n which;

Figure l is a vertical sectional view of a dumb-waiter shaft showing our invention applied thereto, and Fig. 2 1s a deta1l 1nverted perspective view of the device per 86.

As shown in the drawings a indicates a dumb-waiter shaft in which a dumb-waiter b is operated by the rope c, and 6 indicates one of a series of openings in the dumbwaiter shaft which provide access to the shaft from the various apartments with which they communicate. As is well known, these openings 6 are formed of usual wooden framing or the like and by virtue of the sharp edges of this framing on the interior of the shaft the rope is appreciably shaved as it passes over the edges during the operation of the dumb-waiter. Now, to

offset this friction, we provide the device 5 which is mounted on the under side of the upper portion of the opening 0 as shown in the drawings, and thus the rope is prevented from contacting with the edges as stated. This device 5 may be made of any size suitable to the shaft in which it is placed Specification of Letters Patent.

Patented June 29, 1915. Serial No. 870,908.

and consists of a yoke-shaped bracket 6 and a sheave 7 which is rotatably carried by the bracket, and in point of cheapness of manufacture the bracket may be made of cast metal and thus be formed in one piece. The bracket 6 is so formed as to be provided with the bearing portions 88, the rope retaming portion 9 and the attaching portions 1010, which are angularly disposed at opposite sides of the bearing portions as shown.

The bearing portions are preferably vertical in disposition and are in spaced relation with each other so that the sheave may be journaled therein and adapted to rotate in a vertical manner. It will be noted that the rope-retaining portion is formed by the bearing portions 88 which are extended and are joined in a loop or eyelet; thus as the rope is trained over the sheave, the same is normally retained in position on the sheave by virtue of the rope-retaining portion. The attaching portions do not extend the entire length of the bracket, but are of such length so that when the device is mounted on the dumb-waiter shaft, the rope retaining portion may extend into the shaft as shown in Fig. 1; and for the purpose of securing the bracket to the frame of the opening by such means as screws or the like, the attaching portions are provided with the perforations 11 as shown.

For the purpose of readily positioning the rope 0 within the bracket, the sheave 7 is detachably mounted therein. It is quite obvious that the bearing portions are bored such as indicated by 12, and thus accommodate the pin 18, which is provided at one end with a suitable head 14 and is of sufficient length so that its opposite end will extend beyond the bearing as shown. The sheave is rotatably mounted on the pin 13 and thus may be readily detached from the bracket, by removing the pin 13; and for the purpose of securing the pin in a fixed position in the bracket, the extending end of the pin is provided with a diametrically arranged bore 15 which accommodates a cotter-pin 16 or the like, for preventing the pin 13 from being withdrawn. Thus, by virtue of the sheave being detachable, the bracket may be positioned or removed from Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

the bearings, and a sheave ournaled on the pin and having their periphery lying below a plane in which the outer surfaces of the flanges lie.

In. testimony whereof we aflix our signatures in presence of two witnesses.

, LOUIS WIEBKE. I ALBERT WV. BULL. Witnesses:

M. E. LAUGHLIN, G110. A. BYRNE.

Washington, D. C. 

